public override Stream OpenEntry(ArcFile arc, Entry entry) { var mca = arc as McaArchive; int method = arc.File.View.ReadInt32(entry.Offset); if (null == mca || method < 0 || method > 1) { return(base.OpenEntry(arc, entry)); } uint width = arc.File.View.ReadUInt32(entry.Offset + 0xC); uint height = arc.File.View.ReadUInt32(entry.Offset + 0x10); uint packed_size = arc.File.View.ReadUInt32(entry.Offset + 0x14); int unpacked_size = arc.File.View.ReadInt32(entry.Offset + 0x18); var data = arc.File.View.ReadBytes(entry.Offset + 0x20, packed_size); MrgOpener.Decrypt(data, 0, data.Length, mca.Key); if (method > 0) { using (var input = new MemoryStream(data)) using (var lzss = new MrgLzssReader(input, data.Length, unpacked_size)) { lzss.Unpack(); data = lzss.Data; } } int stride = ((int)width * 3 + 3) & ~3; var info = new ImageMetaData { Width = width, Height = height, BPP = 24 }; return(TgaStream.Create(info, stride, data)); }
protected override ImageData GetImageData() { m_input.Position = 0x20; var data = m_input.ReadBytes(m_packed_size); MrgOpener.Decrypt(data, 0, data.Length, m_key); if (m_compressed) { using (var input = new BinMemoryStream(data)) using (var lzss = new MrgLzssReader(input, data.Length, m_unpacked_size)) { lzss.Unpack(); data = lzss.Data; } } int stride = ((int)Info.Width * Info.BPP / 8 + 3) & ~3; var format = 8 == Info.BPP ? PixelFormats.Indexed8 : PixelFormats.Bgr24; return(ImageData.Create(Info, format, m_palette, data, stride)); }
void UnpackV101() { if (m_key != 0) { MrgOpener.Decrypt(m_input, 0, m_input.Length - 1, m_key); } #if DEBUG else // bruteforce key *in debug build only* { var copy = new byte[m_input.Length]; for (int key = 1; key < 256; ++key) { Buffer.BlockCopy(m_input, 0, copy, 0, m_input.Length); MrgOpener.Decrypt(copy, 0, copy.Length - 1, (byte)key); using (var input = new BinMemoryStream(copy)) using (var lzss = new MrgLzssReader(input, copy.Length, Stride * m_height)) { lzss.Unpack(); if (input.Length - input.Position <= 1) { Trace.WriteLine(string.Format("Found matching key {0:X2}", key), "[MCG]"); m_output = lzss.Data; m_key = (byte)key; return; } } } } #endif using (var input = new BinMemoryStream(m_input)) using (var lzss = new MrgLzssReader(input, m_input.Length, Stride * m_height)) { lzss.Unpack(); // data remaining within input stream indicates invalid encryption key if (input.Length - input.Position > 1) { m_key = 0; } m_output = lzss.Data; } }
void UnpackV101() { if (m_key != 0) { MrgOpener.Decrypt(m_input, 0, m_input.Length - 1, m_key); } #if DEBUG else // bruteforce key *in debug build only* { for (int key = 1; key < 256; ++key) { var copy = m_input.Clone() as byte[]; MrgOpener.Decrypt(copy, 0, copy.Length - 1, (byte)key); using (var input = new BinMemoryStream(copy)) using (var lzss = new MrgLzssReader(input, m_input.Length, Stride * m_height)) { lzss.Unpack(); if (input.Length - input.Position <= 1) { m_output = lzss.Data; m_key = (byte)key; return; } } } } #endif using (var input = new BinMemoryStream(m_input)) using (var lzss = new MrgLzssReader(input, m_input.Length, Stride * m_height)) { lzss.Unpack(); // data remaining within input stream indicates invalid encryption key if (input.Length - input.Position > 1) { m_key = 0; } m_output = lzss.Data; } }